Insert Trigger for SQL Server 2008
In SQL Server 2008, you can encounter a scenario where you need to insert data into an EmployeeResult table and ensure that any missing employee-department pairs in the Employee table are automatically added. To accomplish this, you can leverage an INSERT trigger.
To define this trigger, consider the following steps:
CREATE TRIGGER trig_Update_Employee ON [EmployeeResult] FOR INSERT AS
IF EXISTS (SELECT COUNT(*) FROM Employee WHERE ???)
In this line, you need to specify the condition that checks if the employee-department pair exists in the Employee table. The placeholder ??? needs to be replaced with a clause that compares the inserted data with the Employee table.
BEGIN INSERT INTO [Employee] (Name, Department) VALUES (???, ???) END
Similarly, these placeholders ??? need to be filled with expressions that extract the Name and Department from the inserted data.
The completed trigger might look something like this:
CREATE TRIGGER trig_Update_Employee ON [EmployeeResult] FOR INSERT AS IF EXISTS (SELECT COUNT(*) FROM Employee WHERE Name = i.Name AND Department = i.Department) BEGIN INSERT INTO [Employee] (Name, Department) VALUES (i.Name, i.Department) END
In this example, the inserted data is represented by the "i" alias, and the condition checks for the existence of the employee-department pair in the Employee table. If it doesn't exist, a new record is inserted into the Employee table.
By implementing this trigger, you can ensure that whenever an INSERT operation occurs in the EmployeeResult table, any missing employee-department pairs are automatically added to the Employee table, maintaining data integrity and eliminating manual intervention.
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